# PLANESURF [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [What's new](Help%20System/GSTARCAD/2021/What's%20new/(What's%20new).md) You can input PLANESURF command or click Ribbon – Surface – Planto create a planar surface by selecting closed objects or specifying the opposite corners of a rectangular surface. When the corners of the surface are specified by the command, you can create a surface parallel to the work plane.  **SURFU / SURFV:** System variable, sets the number of lines displayed on the surface --- Gstarsoft Co.,Ltd